18V PWM 风扇马达驱动芯片18V PWM Fan Motor Driver CXMD3270是一款单相直流无刷马达驱动芯片，它内置霍尔信号接口，通过PWM模式对风扇转速进行控制。CXMD3270非常适用于PC电源风扇和CPU散热风扇中的可控转速马达驱动。CXMD3270内置功能包括PWM控制模式、最小转速设置、软启动、风扇转速检测、锁定保护、自动重启和霍尔偏置输出。

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     CXMD3270是一款单相直流无刷马达驱动芯片，它内置霍尔信号接口，通过PWM模式对风扇转速进行控制。CXMD3270非常适用于PC电源风扇和CPU散热风扇中的可控转速马达驱动。CXMD3270内置功能包括PWM控制模式、最小转速设置、软启动、风扇转速检测、锁定保护、自动重启和霍尔偏置输出。PWM模式可通过调节RCTL电压控制芯片输出，使马达转速可调并保持低噪声、低抖动。最小转速由RMIN来设置风扇转动时的最低速度。软启动功能使风扇在启动时由慢到快逐渐加速，且加速时间可通过SS电容外部调节。如果风扇被外部应力或者障碍物卡住，则过驱动电流可能引起温度升高而损坏马达。为了防止此类现象，CXMD3270内置锁定保护以关断功率管，切断马达驱动电流。几秒钟后再自动重启，尝试恢复驱动。锁定保护和自动重启时间可由芯片外接电容设定。CXMD3270还具有转速回馈输出、锁定报警输出和霍尔偏置输出。CXMD3270/C is a fan motor driver for the single coil brushless DC motor. With its high efficient direct PWM control mode, CXMD3270/C controls the speed of brushless DC motor with a built in HALL IC interface. CXMD3270/C is suitable to drive variable speed motors for personal computer’s power supply radiation fans and CPU coolers. CXMD3270C integrates PWM fan speed control, minimum speed mode, soft start, fan tachometer, lock protection, auto restart and Hall Bias functions. PWM mode controls fan speed in low noise and low vibration ways by adjusting RCTL voltage. CXMD3270C can set minimum fan speed by presetting RMIN voltage. With soft start function, CXMD3270C can drive motor from slow speed to fast speed in a settable time by setting the external capacitor between SS and GND. If a fan motor is stalled by the external force or obstacles, overdrive current may incur coil overheat and burning. To prevent motor from overheating, the lock protection circuit shuts down the internal power devices for a few seconds after the motor lock is detected. Then the auto restart circuit resumes to power up the internal power devices. If the lock persists, CXMD3270C shuts off power devices for a few seconds. The lock protection delay time is externally programmable by a capacitor. CXMD3270C has built in motor rotation speed feedback (FG) output, motor rotation detection (RD) output and Hall sensor bias output.

   产品特点 返回TOPjXB嘉泰姆

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• 18V单相全波驱动输出jXB嘉泰姆

• 内置过冲吸收电路，无需外接ZenerjXB嘉泰姆

• 软启动和重启，外部可调</p>

• 宽工作电压（3V～18V）</p>

• PWM控制模式jXB嘉泰姆

• 最小转速设定</p>

• 内置Soft SwitchingjXB嘉泰姆

• 内置霍尔偏置jXB嘉泰姆

• 锁定保护与自动重启</p>

• FG输出 (CXMD3270)jXB嘉泰姆

• RD输出 (CXMD3270)jXB嘉泰姆

• 内置热关断</p>

• TSSOP-16与TDFN-14封装jXB嘉泰姆

• 符合RoHS规范及Pb-Free，Halogen-FreejXB嘉泰姆

Built in 18V Full-wave Motor Driver for FanjXB嘉泰姆

MotorjXB嘉泰姆

Built in Input Surge Protection, No Zener DiodejXB嘉泰姆

NeedjXB嘉泰姆

External Programmable Soft Start and SoftjXB嘉泰姆

Restart Function (CXMD3270)jXB嘉泰姆

Wide Input Range 3V~18VjXB嘉泰姆

PWM Fan Speed ControljXB嘉泰姆

Programmable Minimum Fan SpeedjXB嘉泰姆

Built in Soft Switching FunctionjXB嘉泰姆

Built in Hall BiasjXB嘉泰姆

Lock Protection and Auto RestartjXB嘉泰姆

Fan Rotation Speed Feedback FG OutputjXB嘉泰姆

Fan Rotation Detection RD OutputjXB嘉泰姆

Thermal Shutdown ProtectionjXB嘉泰姆

Available in TSSOP-16 PackagejXB嘉泰姆

RoHS Compliant and 100% Lead (Pb)-FreejXB嘉泰姆

Halogen-FreejXB嘉泰姆

   应用范围 返回TOPjXB嘉泰姆

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• PC电源、CPU散热风扇等</p>

Personal Computer’s Power Supply RadiationjXB嘉泰姆

Fans and CPU CoolersjXB嘉泰姆

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